What's new in this release:
Private Browsing with Tracking Protection blocks certain Web elements that could be used to record your behavior across sites
Control Center that contains site security and privacy controls
Indicator added to tabs that play audio with one-click muting
WebRTC improvements: IPV6 support
Preferences for controlling ICE candidate generation and IP exposure
Hooks for extensions to allow/deny createOffer/Answer
Improved ability for applications to monitor and control which devices are used in getUserMedia
Login Manager improvements:
Improved heuristics to save usernames and passwords
Edit and show all logins in line, Copy/Paste usernames/passwords from the Context menu
Migration imports your passwords to Firefox from Google Chrome for Windows and Internet Explorer; import anytime from the Login Manager

good questions. I just added our experiences in an effort to wake someone up. Doing some quick googling, there are various fixes, most involve forcing usage of adobe flash rather than html5. most are posting these without actually realizing that's what they are doing.

the media.fragmented fix above will work, but it disables HD playback. and I think it will only work for new installs, since those settings go into the user profile. might be wrong on that one though.